.top-ruler {
    position: absolute;
    top: 0px;
    left: 20px;
    width: calc(100% - 20px);
    height: 20px;
    border-bottom: 1px solid #a1a1a1;
    display: flex;
    flex-direction: row;
    user-select: none;
    z-index: 10;
    background-color: #787878;
    canvas {
        width: 100%;
        height: 100%;
    }
}
.hundred-mark {
    width: 100px;
    height: 20px;
    line-height: 10px;
    // background-color: #a1a1a1;
    position: absolute;
    top: 0;
    font-size: 10px;
    white-space: nowrap;
    border-left: 1px solid #a1a1a1;
    align-items: flex-end;
    display: flex;
    flex-direction: row;
    .s-mark {
        width: 10px;
        height: 14px;
        border-left: 1px solid #a1a1a1;
        position: absolute;
    }
    .mark-num {
        position: absolute;
        left: 0;
        bottom: 4px;
    }
    // vertical-align: baseline;
}
// .hundred-mark::before {
//     content: '';
//     display: inline-block;
//     width: 1px;
//     height: 20px;
//     background-color: #a1a1a1;
// }
